Detailed Weather Data for Project: PENS

Date Time TAIR WSPD RELH SRAD 30Dec2017 8 a.m. 29.07 15.51 98.42 0.00 30Dec2017 9 a.m. 27.57 17.01 95.21 0.12 30Dec2017 10 a.m. 25.81 16.32 95.88 12.25 30Dec2017 11 a.m. 24.98 15.66 96.71 28.78 30Dec2017 12 p.m. 24.42 14.13 92.70 56.67 30Dec2017 1 p.m. 24.60 12.42 85.94 84.30 30Dec2017 2 p.m. 24.73 11.68 80.68 86.36 30Dec2017 3 p.m. 24.85 11.85 78.27 83.80 30Dec2017 4 p.m. 25.11 10.16 75.66 40.23 30Dec2017 5 p.m. 25.38 9.94 73.31 5.73 30Dec2017 6 p.m. 25.99 9.46 71.25 0.00 30Dec2017 7 p.m. 18.64 13.17 67.51 0.00 30Dec2017 8 p.m. 26.38 4.14 63.44 0.00 30Dec2017 9 p.m. 26.01 4.57 64.05 0.00 30Dec2017 10 p.m. 25.84 5.15 62.01 0.00 30Dec2017 11 p.m. 25.93 5.39 61.91 0.00 31Dec2017 12 a.m. 25.03 11.66 68.86 0.00 31Dec2017 1 a.m. 23.00 14.38 70.38 0.00 31Dec2017 2 a.m. 21.06 16.71 74.40 0.00 31Dec2017 3 a.m. 19.67 17.96 81.38 0.00 31Dec2017 4 a.m. 18.36 19.22 84.89 0.00 31Dec2017 5 a.m. 17.13 16.62 90.01 0.00 31Dec2017 6 a.m. 16.93 16.32 88.26 0.00 31Dec2017 7 a.m. 16.83 15.19 80.79 0.00 Accuml. Values 563.32 304.62 1901.92 398.24 Num. Valid Values 24 24 24 24 Avg. Values 23.47 12.69 79.25 16.59 THE EMPERICAL EQUATIONS REQUIRE THESE PARAMETERS IN THESE UNITS: SRAD == CAL / SQUARE CENTIMETER WSPD == KILOMETERS PER DAY TAIR == DEGREES CELSIUS RELH == PERCENT Converted Values -4.74 490.13 79.25 34.24 Now start computations towards evaporation in inches per day Each intermediate calculation step will be shown. xcompl = 0.2075 definition: xcompl = 1 - (RELH_avg/100) TdC = -7.7796 definition: TdC = TAIR_avg - ((14.55 + (0.114*TAIR_avg))*xcompl +pow((2.5 + 0.007*TAIR_avg)*xcompl, 3) + (15.9 +0.117*TAIR_avg)*pow(xcompl, 14)) del_lambda1 = 0.3316 definition: del_lambda1 = pow(1+(0.66/pow(0.00815*TAIR_avg + 0.8912, 7)), -1) del_lambda2 = 0.6684 definition: del_lambda2 = 1 - del_lambda1 Qn = -0.7493 definition: Qn = 0.00714*SRAD_avg + 0.00000526*SRAD_avg*pow(TAIR_avg+17.8, 1.87) +0.00000394*pow(SRAD_avg, 2) - 0.00000000239*pow(SRAD_avg, 2)*pow(TAIR_avg-7.2, 2) - 1.02 es_ea = 0.9002 definition: es_ea = 33.86 * (pow(0.00738*TAIR_avg + 0.8072, 8) -pow(0.00738*TdC+0.8072, 8)) Ea = 1.6787 definition: Ea = pow(es_ea, 0.88) * (0.42 + 0.0029*WSPD_avg) Daily Evap: 0.034 inches definition: Daily Evap = (del_lambda1*Qn + del_lambda2*Ea) / 25.4

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